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The about:config "This might void your warranty!" warning page may appear. Click I'll be careful, I promise!, to continue to the about:config page.

Type browser.newtab.url in the search box.

Double-click the browser.newtab.url preference and change the url to about:newtab

Click OK, and close the about:config tab.

thank you

In the [[Search your bookmarks, history and tabs with the Awesome Bar|Location bar]], type '''about:config''' and press Enter.
* The about:config ''"This might void your warranty!"'' warning page may appear. Click I'll be careful, I promise!, to continue to the about:config page.
#Type '''browser.newtab.url''' in the search box.
#Double-click the '''browser.newtab.url''' preference and change the url to '''about:newtab '''
#Click OK, and close the about:config tab.
thank you

try the SearchReset add-on, (the add-on resets your search preferences and home page to their default values, and then uninstalls itself)

you can also seek if you have in your profile folder a User.js file. The user.js file does not exist by default. If you have a user.js file and you create the file, don't delete it, if you have not create the file, then delete the User.js file, to see if the problem is there (it happens some programs to create the file).

thank you

Hello,
try the [https://addons.mozilla.org/en-US/firefox/addon/searchreset/ SearchReset add-on], (the add-on resets your search preferences and home page to their default values, and then uninstalls itself)
you can also seek if you have in your [http://kb.mozillazine.org/Profile_folder_-_Firefox profile folder] a [http://kb.mozillazine.org/User.js_file User.js] file. The user.js file does not exist by default. If you have a user.js file and you create the file, don't delete it, if you have not create the file, then delete the User.js file, to see if the problem is there (it happens some programs to create the file).
thank you

Also make sure that the new tab page is enabled (browser.newtabpage.enabled = true).<br />
You can check the 3x3 grid icon in the top right corner
See this article about the New Tab page (about:newtab):
*https://support.mozilla.org/kb/new-tab-page-show-hide-and-customize-top-sites
Do you get this page if you open about:newtab?
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Make sure that you do not run Firefox in (permanent) Private Browsing mode (Never Remember History).
*https://support.mozilla.org/kb/Private+Browsing